| 1 | #!/bin/bash |
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| 2 | # Script to replace uses of 'realpath' and/or 'command -v' |
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| 3 | |
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| 4 | echoerr() { |
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| 5 | cat <<< "$@" 1>&2 |
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| 6 | } |
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| 7 | |
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| 8 | arb_realpath() { |
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| 9 | # replacement for 'realpath' |
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| 10 | # |
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| 11 | # Note: this function is duplicated in ../arb_install.sh@arb_realpath |
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| 12 | local FILE="$1"; shift |
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| 13 | |
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| 14 | local REALPATH=$(realpath "$FILE" 2>/dev/null ) |
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| 15 | local READLINK=$(readlink -f "$FILE" 2>/dev/null ) |
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| 16 | |
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| 17 | if [ -z "${REALPATH}" ]; then |
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| 18 | if [ -z "${READLINK}" ]; then |
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| 19 | echoerr "Warning: neighter realpath nor readlink works here" |
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| 20 | if [ -e "${FILE}" ]; then |
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| 21 | local PWDFILE="$(pwd)/${FILE}" |
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| 22 | if [ -e "${PWDFILE}" ]; then echo "${PWDFILE}" |
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| 23 | else echo "${FILE}" |
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| 24 | fi |
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| 25 | else echo "${FILE}" |
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| 26 | fi |
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| 27 | else echo "${READLINK}" |
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| 28 | fi |
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| 29 | else |
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| 30 | if [ -z "${READLINK}" ]; then echo "${REALPATH}" |
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| 31 | else |
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| 32 | if [ "${READLINK}" != "${REALPATH}" ]; then |
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| 33 | echoerr "Warning: realpath and readlink differ (REALPATH=${REALPATH} READLINK=${READLINK})" |
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| 34 | fi |
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| 35 | echo "${REALPATH}" |
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| 36 | fi |
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| 37 | fi |
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| 38 | } |
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| 39 | |
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| 40 | arb_full_cmd() { |
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| 41 | # report full path of external command (as found by shell via PATH) |
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| 42 | local CMD="$1"; shift |
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| 43 | local FULLCMD=$(command -v "${CMD}" 2>/dev/null ) |
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| 44 | if [ -n "${FULLCMD}" -a ! -x "${FULLCMD}" ]; then echoerr "[no valid full command for '${CMD}: '${FULLCMD}']"; FULLCMD=; fi |
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| 45 | if [ -z "${FULLCMD}" ]; then |
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| 46 | FULLCMD=$(hash -t "${CMD}" 2>/dev/null ) |
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| 47 | if [ -n "${FULLCMD}" -a ! -x "${FULLCMD}" ]; then echoerr "[no valid full command for '${CMD}: '${FULLCMD}']"; FULLCMD=; fi |
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| 48 | if [ -z "${FULLCMD}" ]; then |
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| 49 | FULLCMD=$(which "${CMD}" 2>/dev/null ) |
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| 50 | if [ -n "${FULLCMD}" -a ! -x "${FULLCMD}" ]; then echoerr "[no valid full command for '${CMD}: '${FULLCMD}']"; FULLCMD=; fi |
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| 51 | fi |
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| 52 | fi |
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| 53 | if [ -n "${FULLCMD}" ]; then |
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| 54 | FULLCMD=$(arb_realpath "${FULLCMD}") |
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| 55 | fi |
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| 56 | echo "${FULLCMD}" |
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| 57 | } |
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| 58 | |
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| 59 | usage_error() { |
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| 60 | local ERR="$1"; shift |
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| 61 | |
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| 62 | echoerr "Usage: arb_path.sh -r file" |
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| 63 | echoerr " replacement for 'realpath file' (generates canonical pathname)." |
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| 64 | echoerr " falls back to given input on failure to canonicalize." |
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| 65 | echoerr "Usage: arb_path.sh -x cmd" |
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| 66 | echoerr " replacement for 'command -v file' (finds executable; absolute, relative or via PATH)." |
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| 67 | echoerr " returns empty string if 'cmd' not found." |
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| 68 | echoerr "" |
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| 69 | echoerr "Error: ${ERR}" |
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| 70 | exit 1 |
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| 71 | } |
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| 72 | |
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| 73 | FLAG="$1" ; shift |
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| 74 | ARG="$1" ; shift |
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| 75 | |
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| 76 | if [ -z "${ARG}" ]; then |
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| 77 | usage_error "missing argument(s)" |
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| 78 | else |
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| 79 | if [ "${FLAG}" = "-r" ]; then |
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| 80 | echo $(arb_realpath "${ARG}") |
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| 81 | else |
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| 82 | if [ "${FLAG}" = "-x" ]; then |
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| 83 | echo $(arb_full_cmd "${ARG}") |
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| 84 | else |
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| 85 | usage_error "Unknown flag '${FLAG}'" |
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| 86 | fi |
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| 87 | fi |
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| 88 | fi |
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| 89 | |
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| 90 | |
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